Method for nickel-free phosphating metal surfaces
AssigneeChemetall GmbH
InventorsOlaf Dahlenburg, Lisa Schmeier
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Abstract
Described herein is a method for phosphating of a metallic surface, wherein a metallic surface, optionally after cleaning and/or activation, is first treated with an acidic, aqueous, substantially nickel-free phosphating composition that includes zinc ions, manganese ions, iron(III) ions and phosphate ions, and is thereafter optionally rinsed and/or dried. Also described herein are a corresponding phosphating composition and a correspondingly phosphate-coated metallic surface.
Claims17
A method for phosphating of a metallic surface, comprising optionally cleaning and/or activating the metallic surface, treating the metallic surface with an acidic, aqueous, substantially nickel-free phosphating composition which comprises zinc ions, manganese ions, iron(III) ions and phosphate ions, and optionally rinsing and/or drying the treated metallic surface
- wherein the phosphating composition has a Free acid value in the range from 0.3 to 2.0, a Free acid (diluted) value in the range from 0.5 to 8, a Total acid, Fischer value in the range from 12 to 28, a Total acid value in the range from 12 to 45, and an Acid value in the range from 0.03 to 0.065.
Dependencies are inferred from the claim text.